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The cameras that stayed on Discovery showed it cracking

The cameras that stayed on Discovery showed it cracking

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Diagnostic cameras on Discovery's external tank captured cracking metal - why did the shuttle's final flight keep being delayed?

The cameras that stayed on Discovery showed it cracking

This episode details the challenges faced by Space Shuttle Discovery during its final mission, STS-133, as engineers race against time to address unprecedented issues. It explores the series of technical problems that threatened to ground the most experienced spacecraft ever built.

Mission: STS-133
Spacecraft: Space Shuttle Discovery
Original Launch Date: September 16, 2010
Actual Launch Date: February 24, 2011
Crew: Six astronauts

- Engineers bolted diagnostic cameras to Discovery's external fuel tank to monitor cracking during the countdown, intending to remove them before launch.
- The STS-133 mission, also known as Utilization and Logistics Flight Five, was tasked with delivering the Leonardo Permanent Multipurpose Module.
- Delays began with a monomethyl hydrazine leak detected by a "fishy smell" from the Orbital Maneuvering System propellant line.
- A subsequent hydrogen leak at the Ground Umbilical Carrier Plate stopped fueling, revealing an internal seal compression issue.
- Inspection teams later found cracks in the spray-on foam insulation and two nine-inch cracks in stringer S-72, one of the tank's aluminum-lithium ribs.

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